Jan Allman wrote:
Is it possible to send standard Ethernet packets at near Gigabit
throughput using UDP packets and libpcap?
Has anyone tried this before. I am wondering whether libpcap is a
more optimum approach to the standard Linux "sendto" function.
It could very well be, assuming you are willing to craft your own UDP
headers, but it begs the question "Why?" Most CPU's these days (well,
most "decent" CPUs :) can use send()/sendto() to generate traffic at
gigabit speeds.
Between a pair of 2x1GHz Itanium2 systems running a 2.6.12 kernel:
loiter:/opt/netperf2_work# src/netperf -t UDP_STREAM -H 192.168.4.215 -c
-C -- -m 1472
UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
192.168.4.215 (192.168.4.215) port 0 AF_INET
Socket Message Elapsed Messages CPU Service
Size Size Time Okay Errors Throughput Util Demand
bytes bytes secs # # 10^6bits/sec % SS us/KB
135168 1472 10.00 812799 0 957.1 19.02 3.256
135168 10.00 812799 957.1 23.12 3.958
They weren't even breaking a sweat :)
What sort of problem are you looking to solve?
For just blasting frames onto the wire, there is the in-kernel pktgen
stuff under linux.
sincerely,
rick jones
-
This is the tcpdump-workers list.
Visit https://lists.sandelman.ca/ to unsubscribe.
